Use Index map in PGM #1639
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Use Index map in PGM #1639
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| auto seng_global_agg = imap.map_to_global( | ||
| send_agg, experimental::distributed::index_space::local); |
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If I guess it correctly, you map the local index back to the global index to avoid the collision.
this is what I want to avoid because it needs twice of memory transferring between nodes.
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I would guess that the actual volume of the data transfer is negligible compared to the latency cost. Also, this is significantly simpler to what was there before.
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Signed-off-by: Marcel Koch <[email protected]>
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This PR enables using an index map to create the coarse level using PGM for distributed matrices. IMO this simplifies the PGM implementation, since there is no 'manual' implementation needed anymore.
This also has some consequences for the
distributed::Matrixclass. Namely, when creating a matrix with from local and non-local parts, an index map has to be supplied, instead of the list of vectors. Again, I think this should simplify the interface. Note that currently there is no accessor to the index map, since it's not necessary. But it might be useful for consistency.I guess this is also an interface breaking change.
Todo:
gather_as_global_index